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STOCK-BASED COMPENSATION - Fair Value Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Stock options, Number of Shares |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  | 14,941,000 |  |
Exercised (in shares) |  |  | (1,711,000) |  |
Cancelled or forfeited (in shares) |  |  | (53,000) |  |
Balance at the end of the period (in shares) | 14,204,000 |  | 14,204,000 |  | 14,941,000
Vested and expected to vest in the future at the end of the period (in shares) | 13,594,000 |  | 13,594,000 |  |
Exercisable at the end of the period (in shares) | 8,174,000 |  | 8,174,000 |  |
Stock options, Weighted-Average Exercise Price Per Share |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  | $ 42.88 |  |
Exercised (in dollars per share) |  |  | 38.30 |  |
Cancelled or forfeited (in dollars per share) |  |  | 52.91 |  |
Balance at the end of the period (in dollars per share) | $ 44.81 |  | 44.81 |  | $ 42.88
Vested and expected to vest in the future at the end of the period (in dollars per share) | 44.23 |  | 44.23 |  |
Exercisable at the end of the period (in dollars per share) | $ 36.97 |  | $ 36.97 |  |
Weighted-Average Remaining Contractual Term (in years) |  |  |  |  |
Weighted-Average Remaining Contractual Terms (in years) |  |  | 6 years |  | 6 years 3 months 18 days
Vested and expected to vest in the future at the end of the period |  |  | 5 years 10 months 24 days |  |
Exercisable at the end of the period |  |  | 4 years 8 months 12 days |  |
Aggregate Intrinsic Value |  |  |  |  |
Balance at the beginning of the period |  |  | $ 308,884 |  |
Balance at the end of the period | $ 502,732 |  | 502,732 |  | $ 308,884
Vested and expected to vest in the future at the end of the period | 488,969 |  | 488,969 |  |
Exercisable at the end of the period | $ 353,333 |  | $ 353,333 |  |
Granted 01/01/20 - 03/31/20 |  |  |  |  |
Stock options, Number of Shares |  |  |  |  |
Granted (in shares) |  |  | 1,027,000 |  |
Stock options, Weighted-Average Exercise Price Per Share |  |  |  |  |
Granted (in dollars per share) |  |  | $ 62.45 |  |
Stock Options |  |  |  |  |
Weighted-average assumptions used to estimate the fair value of options granted |  |  |  |  |
Dividend yield (as a percent) |  | 0.00% | 0.00% | 0.00% |
Expected volatility (as a percent) |  | 30.20% | 30.50% | 30.20% |
Risk-free interest rate (as a percent) |  | 1.40% | 0.70% | 2.40% |
Expected term |  | 5 years 9 months 18 days | 5 years 9 months 18 days | 6 years |
Stock options, Number of Shares |  |  |  |  |
Granted (in shares) | 0 |  |  |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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